An over-nonlocal implicit gradient-enhanced damage-plastic model for trabecular bone under large compressive strains

Kód výsledku v IS VaVaI

RIV/68407700:21110/15:00230623 - isvavai.cz

Výsledek na webu

http://dx.doi.org/10.1002/cnm.2728

DOI - Digital Object Identifier

10.1002/cnm.2728

Jazyk výsledku

angličtina

Název v původním jazyce

An over-nonlocal implicit gradient-enhanced damage-plastic model for trabecular bone under large compressive strains

Popis výsledku v původním jazyce

Purpose: Investigation of trabecular bone strength and compaction is important for fracture risk prediction. At 1?2% compressive strain, trabecular bone undergoes strain softening, which may lead to numerical instabilities and mesh dependency in classical local damage-plastic models. The aim of this work is to improve our continuum damage-plastic model of bone by reducing the influence of finite element mesh size under large compression. Methodology: This spurious numerical phenomenon may be circumvented by incorporating the nonlocal effect of cumulated plastic strain into the constitutive law. To this end, an over-nonlocal implicit gradient model of bone is developed and implemented into the finite element software ABAQUS using a user element subroutine. The ability of the model to detect the regions of bone failure is tested against experimental stepwise loading data of 16 human trabecular bone biopsies. Findings: The numerical outcomes of the nonlocal model revealed reduction of fin

Název v anglickém jazyce

An over-nonlocal implicit gradient-enhanced damage-plastic model for trabecular bone under large compressive strains

Popis výsledku anglicky

Purpose: Investigation of trabecular bone strength and compaction is important for fracture risk prediction. At 1?2% compressive strain, trabecular bone undergoes strain softening, which may lead to numerical instabilities and mesh dependency in classical local damage-plastic models. The aim of this work is to improve our continuum damage-plastic model of bone by reducing the influence of finite element mesh size under large compression. Methodology: This spurious numerical phenomenon may be circumvented by incorporating the nonlocal effect of cumulated plastic strain into the constitutive law. To this end, an over-nonlocal implicit gradient model of bone is developed and implemented into the finite element software ABAQUS using a user element subroutine. The ability of the model to detect the regions of bone failure is tested against experimental stepwise loading data of 16 human trabecular bone biopsies. Findings: The numerical outcomes of the nonlocal model revealed reduction of fin

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JJ - Ostatní materiály

OECD FORD obor

—

Projekt

GAP108/11/1243: Model pro porušení spongiózní kosti s uvážením velkých deformací a anizotropie

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

International Journal for Numerical Methods in Biomedical Engineering

ISSN

2040-7939

e-ISSN

—

Svazek periodika

31

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

32

Strana od-do

1-32

Kód UT WoS článku

000363583800001

EID výsledku v databázi Scopus

2-s2.0-84946480444